All Questions
Tagged with buck power-electronics
129
questions
0
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319
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What role does the inductor and output capacitor play in a buck converter? [closed]
What role do inductors and capacitors play in buck converters?
I know it acts as an LC low-pass filter.
What other role does it have? When the switch opens, does the capacitor discharge in the load? ...
- 17
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votes
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85
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Buck Converter Output Is Coming To More Than The Designed Value After 3 Or 4 Months In Some Boards
I have a buck converter which converters 12V to 5V,3A. The output of this buck converter is going to a load switch and from the load switch it is going to a connector.
What we observed is that after 3 ...
- 2,593
0
votes
1
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72
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MPQ4470 12V to 5V, 3A output is not simulating as expected in SIMPLIS
I am new to SIMPLIS, simulating this IC for converting 12 V to 5 V.
My first SIMPLIS circuit diagram is given below. My input is 12 V and the required output is 5 V. The load will take a maximum ...
- 2,593
1
vote
2
answers
1k
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Minimum Inductance for Buck converter to maintain CCM
In a buck converter, consider all components to be ideal; the
output voltage is kept constant at 5 V by controlling the duty
cycle. The input voltage varies between 10 V to 40 V, the
output power is ...
0
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1
answer
128
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Wider width or more fingers for CMOS transistor to reduce conduction loss in syncrhonous buck converter?
For a project, I am trying to optimize my buck converter to obtain a power efficiency of 87 %. The non-optimized buck converter gives a power efficiency of 86 %.
I try to size my PMOS 'power' ...
- 113
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78
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Can the MP9488 circuit be operated at 333mA output current?
I am looking to use the MP9488 as a buck Switching Regulator with a voltage output of 12V and output current of 333mA. In the application note it has an output current of 300mA.
As far as I understand ...
2
votes
2
answers
2k
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How do switches work in ltspice?
I Have set up my switch according to the rules specified, using the dot command to determine the behavior of the switch but I still get the error.
"Can't find definition of model 'S1'"
I ...
- 29
4
votes
2
answers
3k
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LTspice Frequency Response Analyzer (FRA)
This post is a continuation of this question.
LTspice recently introduced a new feature called frequency response analyzer, see the image below.
The green box shows the symbol for FRA. If you click ...
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0
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answers
114
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Buck converter inductor selection: maximum switch current limit vs output current
I need to select an inductor for this buck converter. Its output current is 3 A and maximum switch current limit is 6 A. As far as I know, I need to select an inductor whose current ratings (both DC ...
- 2,593
6
votes
2
answers
967
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How to measure the stability of a buck converter using LTspice
Below is my buck converter circuit. How can I check its stability using LTspice?
I need to measure GM and PM.
Is this true that a 30–60 degrees phase margin and a gain margin of 2–10 dB are desirable ...
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0
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332
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Ferrite bead in series with buck inductor
Background
When filtering DM noise from SMPS, I have often used LC filters in the past. One thing that happens with regular inductors though, is that very high frequency (>100 MHz) switch noise ...
- 22.5k
1
vote
1
answer
114
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PFC (Power Factor Correction) harmonics
I recently succeeded in creating a powerful buck PFC with a value almost equal to 1 (0.999)
As you know there are always problems when dealing with real life circuits. I mean, the PFC value is real, ...
- 107
0
votes
1
answer
113
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Buck converter confusing output voltage waveform
I've constructed a simple DC-DC buck converter circuit in Simulink with ideal components.
I'm getting a weird output voltage waveform. Although the average output voltage matches my calculations, the ...
- 23
3
votes
0
answers
96
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Need help to identify this IC
I am struggling for about three days now to find the part number for U118. Tried every online database, but I still cannot figure it out. Marking is 14YN/H 891 A981.
Any ideas about which manufacturer ...
- 41
2
votes
1
answer
374
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In MOSFET switching loss calculation, where does the 0.5 factor come from?
I am going through this material for calculating the switching loss of the mosfet.(https://www.monolithicpower.com/frequency-selection-in-switching-power-supply-designs-part-i)
The switching loss ...
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